The SFB 1477 LiMatI investigates light-matter interactions at interfaces using strong and ultrafast fields. The goal is to understand the effects of the geometric, electronic, and topological structure of light-matter systems on subcycle emission in strong fields and to control specific excitations and their transport dynamics through tailored optical and electronic properties of interfaces. The research benefits from advances in strong-field laser physics, integrated photonics, and condensed matter physics to expand the interactions between light and matter at surfaces. Strong ultrafast fields influence the charge and energy flow in matter and lead to nonlinear ionization as well as nonlinear optical responses such as high harmonic generation. Within the framework of "networked matter," dedicated targets are investigated, representing specific light-matter landscapes and enabling precise analysis of physical effects. These could include, for example, 2D composite materials for long-lived excitons, clusters on surfaces for directed electron emission, and nano-tips for extremely near-field-enhanced photoemission. Further examples include waveguide circuits for exploring topological photonics, molecular films for high harmonic generation, and nanocrystals for investigating exciton-plasmon coupling. The methods used are also applied to investigate "networked matter." 

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